`[tcl::unsupported]::inject`

[AMG]: What is this new command?  This [http://core.tcl.tk/tcl/info/988bbef5f1210c85109a439c6ccbb88beacd775d] appears to be the initial check-in, which says that it takes arguments [[::tcl::unsupported::inject coroname command args]] and makes the named command be the first thing the coroutine does the next time it's resumed.

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